Make-and-break mechanism for electrical circuits.



APPLICATION FILED APR. '7 1910.

Patented Sept. 12, 1911';

|N VENTOR J. WALTER. MAKE AND BREAK MECHANISM FOR ELECTRICAL GIRGUITS. APPLICATION FILED APR. 7, 1910.

92,887. Patented Sept. 12,1911.

2 SHEETS-SHEET 2.

FIGB.

FIGE- WITNESSES: INVENTOR clapses in turning disk 11 to bring pin 12' and an index finger l7 afford means for determining with accuracy the position of stop 15.

The weight 22 or equivalent clock-driving means engages the stem 19 through cord 1-1, and tends to turn disk 11 in opposition to spring 13. The'power of weight 22 exceeds that of springlCfi, and its eil'ect in turning disk ll is controlled in pointv of time by the clockwork 14-.

It will thus be seen that the time which into engagement with lever 7 depends on the initial position of pin 12, and since this is dependent, as will presently be more fully explained, upon the setting of stop 15, the duration of this interval may be accurately predetermined.

The weight 22 is connected by the cord 21 with the. swinging bar of the printing frame, and means, such cords 23, are provided for sustaining the weight from the body of the frame when the cord 21 is slacked by the opening of the printing frame. The closure of the frame brings weight 22 again into operation relative to the clock-work. Means are provided for starting the clock-work upon the closing of the frame, and the means to this end preferably consist of a pivoted finger 24:, swung by a cord 25 connected with bar 8'; so that, upon the closing of the frame, finger swings to engage the balance wheel 26 of clock-work it, thus causing it to swing.

The operation will readily be understood. T he object is to maintain the printing light burning for a predetermined time after the closure of the frame, and for the extinction of the light at the end of such time. \V hen the frame is open, weight 22 is carried in inactive position. Under such condition, stop 15 may be shifted to the desired position, and, as it is shifted, disk 11 will turn in response to the tension of spring 13, pin 12 remaining always in contact with stop 15. The position of the stop being fixed, the negative and printing paper adjusted, the frame is closed. Thereupon, the printing light is ignited through any prefi-a-red instrumentality, as by a contact controlled by a rod 27. The closure of the l ame raises avc'ight 22 from its inactive position, and

being dependent on the initial position of stop 15, as already explained.

A stop, 28, may be provided, limiting the ivotal movement of bell-crank lever 7, and bringing it to a stop while still in the path of revolution of pin 12. By such means further rotation of the disk is prevei'itcd and the clock-work stopped.

I claim herein my mvcntion:

l. A make-and-ln'eak device for an electrical circuit including a movable contact piece yieldingly held in engagement with a corresponding contact piece, a moval'ile member a1"anged to engage within the range of its movement said movable contact piece, a spring exerting its tension to hold said movable member out of engagement with said contact piece, and a clock-work operatively connected to said movable member, and in operation ad *ancing said movable member to cngagc and swing said movable contact piece against the resistance of said spring, substantiall i as described.

2A make-and-break device for an electrical circuit including a movable contact piece yieldingly held in engagement with a corresponding contact piece, a movable member arrai'iged to engage within the range of its movement said movable contact picce, a spring exerting its tension to hold said movable member out of engagement with said contact piece, an adjustable stop determining the extent of rctrogression of said movable member from engagement, with said movable contact piece, and a clockwork opcratively connected to said movable member, substantially as described.

3. In a circuit breaker, the combination of a movable contact piece held yieldingly in engagement with a second contact piece, a

-rotary member arranged to engage within the range of its rotation said movable contact piece but held yieldingly out of engagemcnt therewith by a spring,astationary dial, a rotary adjusting member provided with means for limiting the range of movement of: said rotary member, said adjusting member further provided with an index finger movable therewith and adjacent to said stationary dial, and means to move said rotary member with a uniform speed against the resistance of sald spring, subsiantiall as described.

4. in a circuit breaker for a photographic printing machine, the combination of a movnblc contact piece held yicldingly in cngagcmcnt with a second contact piece, a rotary member arranged to engage within the range of its rotation said movable contact ])l(.'(i(', but held vicldingl v out/of engagement therewith, by a spring, a stationary dial. a rotary adjusting member consisting of a stem provided with an arm for limiting the return movement of said rotary member and with an index arm movable therewith and registering on said stationarydial, and a weight o eratcd clockwork for moving said rotary member against the resistance of said spring, substantially as described.

5. In a circuit breaker for a photographic printing machine, the combination of a 1110iable contact piece held yieldingly in engzlgmnent with a second contact piece, a movable men'iber arranged to engage Within its movement said movable contact piece, a

Lspring exerting its tension to hold said niox'uble member out. of engagement with said contact piece, a weight-operated clockwork connected to said 1110 *able member and in its operation nmi vgsr mid movable memset my hand.

' JACOB WALTER. Witnesses:

JOHN A. WALTER, BAYARD H. CiIRISTY. 

